Machine tool



Nov. 25, 1930. A. M. JOHNSON 1,782,573

MACHINE TOQL .Filed July 23. 1927 6- Sheets-Sheet 1 Fig.1.

Nov. 25, 1930. JOHNSON 1,782,573

MACHINE TOOL Filed July 23, 1927 6 Sheets-Sheet 2 Nov. 25, 1930. A. M. JOHNSON MACHINE TOOL Filed July 23, 1927 6 Sheets-Sheet 3 lfivamtmw Jibert J1 J571/7w0n Nov. 25, 1930. A. JOHNSON MACHINHTOOL Filed July 23, 1927 6 Sheets-Sheet .4

H l l l JZLZJOTZ' 6 M Nov. 25, 1930. JOHNSON 1,782,573

MACHINE TOOL 7 Filed July 23. 1927 6 Sheets-Shut 5 472116122511 Y J/Zbcri' J7. LEE 025072 may Nov- 2 1930. A. mfJoHNsom 1,782,573

MACHINE TOOL Filed July 23, 1927 6 Sheets-$heet 6 EYE/1215f.- JiZbarZ J7. Jizmjom,

. Patented Nov. 25, 1930 UNITED STATES ALBERT JOHNSON,

PATENT. OFFICE. U

or ROCKFORD, inmnorsnssienon 'rOBAnNns DRILL COM- rAivY, F nooxroan, ILLINOIS, A, CORPORATION OEILIJINOIS MACHINE r001;

' Application filed July 23,

. The invention relates to machine tools of the type which are adapted to perform drilling, oring, reaming, and allied operations. The principaLobject of theinvention is to provide a unitary spindle supporting structure embodying improvements enabling an.

. especially "compact arrangement of thespindle operatmg mechanisms with conven ently accesslble, controll ng-devices therefor, and

having particular advantage when "used either as an individual unit or in amulti'iinit Qmachineof thegang type. designed for large production-On similar work with a minimum of attendance.

. Another object is to provide completeenclosure 'ofjthe trains of change-speed and change-feed gears for operatlng the toolholding sp ndle, such enclosure b e ngfan ranged in compact form permittingthe closely proximate lllQHIltlIlg Of several ndependent spindle units upon a single base. 7 Another obj ectis toprovide a, unitary substructure carrying the change-feed gears,

which is'removable as a unit from the head I casing for inspection and repair.

Another object is to provide an improved construction of change-speed and. feed mechanisms so that all control levers are brought forward of the frontof the supportingv head structure for easy manipulation by an operator stationedbefore the machine.

Other objects and advantages will be apparent in the following detailed description Fig. 2 is a side elevationrof the same.

Fig. 3 is an enlarged side elevation ofthe unit head structure partiallyin section. Fig. 4 illustrates the spindle driving mechanism and speed control devlces as seen from above perpendicularly to the. axis of 1927. Serial No. 207,862. i

thechange-speed gear shafts and with the casing cover removed. h M V l p Fig. 5 is a fractional sectional front elevation or thehead structure illustrating the spindle feed change-speed gear train.

Fig. 6 isa detailed view of the sub-structure carryingthe change-speed gears in the l.

feed train. l

Fig. 7 is a fractional sectional view of the mechanism for selectively engaging' the change-speed gears in the feed train;

Fig. 8 is a detailed viewof the speed braking mechanism.

Figs. 9 to 12 inclusive, are detailed illus trations of the interloclringxdevice for the speed change" control leversrl;

ReferringtoFigs. 1 and 2, the numeral 1 indicates a baseupon which is mounted a supportcolu1nn2, the upper portion of which is provided with a pair of spaced upwardly extending head casing supportsS; Forco'n- IVBIHBILCG, the drawings hereln lllustrate the machineas provided with two unitary spindle structures indicated generally at A and B.

It will be understood that the base 1 and column. 2 may beextended laterally to any accommodate any number ofspindle heads, also that the base and column may be con structed to accommodate one spindle head that the column 2 is a unitary integral struc: ture of unusual depth and of length depending upon the number of. spindle heads mounted thereon, such provision giving a high degree of. rigidity to the work supporting andspindle supporting structures, with assurance that all springing of the frame membersunder the strain of the operation of the tool is practically eliminated.

- Forwardly ofthe column 2 is positioned work supporting tablel lretained in its relation to the column 2 by means of interengaging ways provided on the proximate portion of the table 4 and indicated at'5 with the slide ways 6 provided on the front face at each end of the column 2, the slide ways 6 guiding the vertical movement of the table 4 in rel on to he $091 spi d en landl ne .desired length, and provided with any desired number of head casing supports 3 to 'in a single spindle machine. It will be noted having a greater number of spindle heads, it

advanta eous to provide similar intermediate slide ways on the column and the work table.

Under suppm't for work table 1 is provided by means of sectional column conugrising a series of supporting blocks 7 which may be assembled in any desired conibiuatio'jn of height: to position the table at the desired level. These blocks being of large crosssectional area and rigidly bolted together, and likewise securml to the base and to the table, provide an extremely rigid adjustable support which practically eliminates any play in the work table under pressure from the operating tool.

Mounted upon each of the upwardly extending supports 3 is a unitary head casing 8 upon which are supported the tool carrying spindle, the mechanisms for operating the spind e, and the controls for those mechanisms. The several unitary head structures which may be so mounted in a gang drill are similar in construction and arrangement, and the detailed description of one will apply to all. r

The head casing 8 is rigidly secured to its under support, and is provided on its front face with a. pair of spaced forwardly extending bearing portions 9 and 10 within which a spindle assembly is supported for rotative and longitudinal reciprocal movement.

Referring to Figs. 1 to 3, the spindle 11 is provided at its lower end with a conventional tool holding chuck 12 and is rotatively supported within a reciprocatory sleeve 13, the latter having its bearing in the bearing portion 10 of the casing. The spindle 11 extends upwardly from the sleeve 13 a substantial distance, and is threaded immediately adjacent the upper end of the sleeve to receive a bearing collar 1 1 which is provided to hold. the spindle in relative longitudinal position within the sleeve. The sleeve 13 is provided on its rearward side with rack teeth extending longitudinally of the sleeve, by

' which the longitudinal travel of the spindle is caused and controllec as hereinafter described.

The upper portion of the spindle 11 is provided with longitudinal grooves indi- :ated at 15 which extend through a splined bearing collar 16, the latter having suitable rotative bearing ipport in the upper hearing portion 9 of the casing.

Above the bearing portion 9 of the casing in a bevel gear 1? having suitable hearing support in a housing forming part of the head casing, the gear being splined upon the upper end of the spindle 11. The gear 17 functions to impart rotative movement to the spindle.

Angularly positioned in the rearward portion of the head casing 8 and housed therein is a drive shaft 18 having its bearings in suitable cross members provided in the easing. (See Fig. 4.) The drive shaft 18 carries a driving pinion 19 at its upper end in constant mesh with the bevel gear 17. Parallel to the shaft 18 is positioned a changespeed shaft 20 also having suitable hearings in the cross members of the casing. Alined with the shaft 18 is a third shaft 21, and parallel thereto is a fourth shaft 22, both having their bearings in the casing cross members. The adjacent ends of the respective pairs of shafts are indicated at 23 and 24. Preferably the shafts 18, 20 and 21 are arranged in horizontally spaced relation so that their axes define a plane whose intersection with a horizontal plane forms a line normal to the horizontal projections of said axes.

Preferably, the casing 8 is substantially in the form of a right isosceles triangle positioned with one of its sides vertical and having a removable upper Wall 8 sloping downwardly and rearwardly.

The upper shaft 20 is provided with a. pair of spaced rigidly mounted change speed gears 25 and 26,'the lower one 26 being in constant mesh with a gear 27 rigidly mounted on the upper end of the lower shaft 21. The upper gear 25 is selectively engaged with a gear 28 splined upon the shaft 18. The gear 28 is slidable into and out of engagement with the gear 25 by means of :1 yoke 29 of conventional construction and having a slidable bearing upon a guide rod 30 secured to the cross members of the cas- The hub of the gear 28 is extended as indicated at 31 to form one member of a clutch device adapted to be moved into on gagement with a complementary clutch member 32 formedon the side of gear 27 on the upper end of the lower shaft 21. The clutch members are so arranged that with the gear 28 moved downward out of engagement with the gear 25, the clutch members may be engaged to effect the direct drive of the upper shaft from the lower shaft. \Vith the gears 28 and 25 engaged, the clutch members 31 and 32 are disengaged, and the upper shaft 18 is driven at reduced speed from the lower shaft 21 through the gears 27, 26, 25, and 28.

The shifting yoke 29 is controlled by means of a crank 33 having operative engagement with the yoke, the crank having its pivotal bearing in a side wall of the (as ing and carrying at its outer end a control lever 34 fixed thereupon and extending forwardly of the front portion of the casing for easy manipulation by an operator positioned before the machine.

The lower shafts 21 and 22 are provided with two independent sets of changespeed gears. The lower shaft 21 is provided with spaced gears 35, 36, 37 and 38 rigidly mounted on" the shaft. "Complementary to thenpper two gears -and 36"are a pair of gears 39 andj4O adapted respectively for selective engagement therewith and being-splineld on theshaft 22. The'splined gears 39 and 40, preferably of integral structure; are controlled by means of a conventional shifting yoke 41 slidably mounted on the rod 30. The

,yokeai is operated by a crank 42 opera tivelyengaged therewith and pivotally mounted. in theside wall of .the casing, ex

tending. tlierethrough to receive inrigid attachment at its outer end a control lever 43 extending forwardly of the frontrface of er the latter pair-of gears is shifted by means of another conventional yoke 46, slidably mounted on the rod 30: and controlled by a erank' 47. The crank 47 is pivotally mounted in thesideiwall 01 the casing and extends therethrough'to receive in rigid attachment a control lever 48 also extending forwardly oi the frontfportionof-the machine.

It willfherebe'observed' that the arrangementfof shafts and gears just described ac com-plishes a very compact construction of speed 1 change mechanism for rotating" the spindle and requires a minimum of housing space.

An interlocking mechanism, (see Fig. 2

' and Figs. to 12, inclusive). is provided hetween the change speedcontrol levers 43 and 48, to avoid thepossibility of accidental engagement of the two sets of change speed gears at the same time with obvious damaging results to the mechanism. The interlocking device is indicated generally at O, in Fig. .2. V r a V Referringto Figs. 9 to 12 inclusive, the lower lever 48 is provided with a concentric flange 49 formed adjacent the pivot and having a slot 50 provided at its mid-portion.

The upperlever 43 is also provided with a concentrictfiange 51 extending lnto ]I]i36I611-- gaging relation'with the flange 49 and suitably formed on-ja lateral extension of the lever structure. The flange 51 is also provided with a slot 52 so positioned that withlhoth levers in neutral position, whereby both sets of two slots are"then.in register.

change speed gears are out of engagement, the While in the latter position, it will be obvious'th'at either lever may be moved in either direction, whereupon its respective flange moves through the slot provided in the other flange and thereby locks the other lever against movement until the first lever is again returned to neutral position, By' this means there is no possibility of shifting both sets of change speed gearsinto mesh at the same time.

The flanges 49 and 51 preferably are progears 44 i and mounted on the main shaft59 and slidable merit of the bell cranlitill.

vided with stop lugsi53 adapted to limit the movement oi'ithe lever bein shift ed eh- I gagement with the flange 0 theother lever.

The lower drive shaft 22 extends'through its bearingin the 'lowerone of the cross frame mounted on its lower end and enclosed within a housing 56 formed in the lower rea'rfward portion of the casing. The two bevel gearsl54:and 55 are-respectively in constant mesh with the bevel gears57 and 58 freely j mounted on the main shaft 59 extendinglatwith a clutch mechanism generally indioated at 60 and 61. These clutch devices may be of any desired conventional construction and are not herein described in detail. The clutches 60 and 61 are adapted to engage the gear-s57 and 58selectivelywiththe shaft by means of a clutchoperatingfcollar 62 into selective operative relation to either or the clutches. The selectiveposition ofthe collar 62 is controlled bya .bellerank 6 3 having pivotal support upon the. lower wall of the housing. One arm of'the bell crank 63 is formed to provide a yoke having co ventional operative engagement with the collar 62. The other arm 7 of the bell crank is pivotally attached to an 'operating rod 64 having a suitable bearing in the frontwallot the housing 56 and extending therethrough into pivotal engagement with a crank arm 65 mounted on the outer wall of the casing 8 and having integraltherewith a eontrollever 66 extendingforwardly of the front portion of the head casing.

l Vithin thehousing, the rod 64 is provided with a cam collar 67 fixed thereupon and having an annular groove 68 provided in its midportion. Associated with the-collar 67 is a bell makes (see Fig. 8) mounted on the side wallof the housing and having its pivotal axis para .lelto the longitudinalaxis of the operating rod The arm of the bell crank extending adjacent to the collar 67 is pro-1 vided with a roller 70 piv otally mountedbetween suitable hearing extensions of thebell crankand having. its axisin a plane perpendicular to the axis of the operating rod. The roller-TO is in constant Contact with tho tace of the cam collar 67, and with the ii'lovenieid of the latter the rollerpasscs into and out at theannulargroove168 with consequent movehe other arm of thebellcranlr supportsone end of a spring 71 confined under tension between thebell cranlr and the side wall of "the housing, with the stant contact with the collar. I

A brake drum 72 isrigidly mountedon the speed drive shaft 22, and cooperatively asso- .70 HIGIIIDBIS of the cas ng and carrles a PHIPOT g concentric bevel gears 54 and 55 rlgidlyciated therewith is a brake band 73 having fixed attachment at one end of the wall of the housing by means of the bracket 7% and the adjustable eye-bolt $5. The other end of the brake band is secured to the arm of the bell crank (39 extending adjacent the collar 67. ihe cam collar 67 is so positioned upon the operating rod (3-1 that when the clutch collar (52 is in neutral position, the roller 70 is posi tioned in the groove {38, with the effect of tightening the brake band uponthe drum and immediately stopping the movement of the spindle driving train. Movement of the operating rod (hf in either direction to engage either of the driving gears 5'7 and 58, moves the roller 70 outwardly upon the cam collar (37 and elieets the release of the brake band from the brake drum.

The longitudinal feeding movement of the tool carrying spindle, the changing of speed of the feeding movement, and the downward limitation of that moven'ient is ZUPOlDPliSlWt'l by means now to be (ihscribed. In. its preferred form, this feeding mech sin is arranged to lie mainly beneath thiangularly positioned shafts 18. 20 and 21 in the triangularly shaped space between the plane of the shafts and the drill spindle 11. The arrangement of these shafts in horizontal spaced relation makes it possible to produce an exceedingly compact drilling unit having a spur gear feeding mechanism embodying feed change means. The bearing collar 16 supporting the upper portion of the spindle 11 is provided on its outer periphery with a vorm thread as indicated at 76, in Fig. 3.

peratively engaged with the worm a worn 77 (see Fig. mounted on a shaft 78 having suitable bearings provided on the opposite side walls of the head casino 8. Formed preferably integral with the worm gear 77 is a spur gear 79 also mounted on the shaft 78.

Operated by the-gear 79, is a train of change-feed gears positioned within the easing 8 and supported as a unit upon a sub structure having. as its outer member the plate 80 (see Fig i and ti) reniiowibly secured upon the margin of an opening in the side wall of the using 8. Integral with the plate 80 is a web 81 extt-mding inwardly of the casing and carrying a bearing bracket 82 spaced from the outer plate 80. A gear 83. having constant engagement.with the drivinggear F9, is rigidly mounted on a sl'iat't 84 having its bearings in the upper end of the hearing bracket 82 and the outer plate 80. The shaft 84. also carries a plurality of change feed gears, in the present instance four in number and indicated at 85, 85, 87, and 88, the latter ars being rotatively mounted upon the shaft.

The shaft 84 is provided with an axial bore (see Fig. 7) within which is provided mechanism for causing selective engagement of the several change feed gears with the shaft. This means comprises a longitudinally slidable plunger 89 positioned in the bore 90 and having a series of annular rack teeth 91 provided in its outer end portion. The inner end of the plunger 89 is bifurcated to receive a gear engaging dog 92, one corner of the end portion of the dog being pivotally secured to the plunger. A compression spring 93, is seated in a suitable pocket in the plunger, bears under tension against the opposite corner of the end portion of the dog and tends to move laterally the outer end of the dog. The outer end of the dog is provided with a laterally extending gear engaging projection 94, which moves through a longitudinal slot in the shaft 8 1 and is adapted to be engaged selectively within longitudinal slots formed in the inner hearing surfaces of the gears 85 and 88. \Vith the longitudinal movement of the plunger the gear engaging projection of the dog is drawn through the slot in the shaft for register with either of the change speed gears selectively, the dog being deflected into the bore, in passing from engagement with one gear to another, by spacing washers 9 1 interposed between the several gears.

The plunger 89 is operated by means of a pinion 95 having engagement with the rack teeth 91 and rigidly mounted on a control shaft 96 extending forwardly through the front Wall of the head casing. A hand lever 97 (see Fig. 1) is mounted on the outer end of the shaft 96 outwardly of the front portion of the head casing, and may have associated therewith an indicating quadrant 98 to guide the operator in selecting the desired feed combination for the work to be done.

A group of intermediate feed-change gears 95), 100, 101, and 102, having constant mesh respectively with the gears 85, 86, 87, and 88, are rigidly mounted on a shaft 103 having suitable hearings in the sub-structure outer plate and the bearing bracket. The intermediate shaft 103 also carries a rigidly mounted gear 104. A third shaft 105 is provided in the bearing bracket 82 and the outer plate 80, the shaft extending outwardly through the latter. A pair of gears 106 and 107 are freely mounted on the shaft 105, the gear 106 having constant mesh with the gear 104 on the intermediate shaft. and the gear 107 having constant mesh with one of the other intermediate gears 101. The gears 106 and 107 are spaced part. and are provided at the iii-- ner ends of their respective hub portions with clutch teeth adapted to be engaged selectively by the complementary clutch teeth of a longitudinally slid-able collar 108 keyed on the shaft 105.

The position of the clutch collar is con trolled by means of a conventional shifting yoke 109 rigidly supported upon a rod 110 having longitudinally slidable hearings in Mounted onthehuh 116 is a swinging housing bearing in the sidewall of the head casing the substructure outer plateand the hearing bracket. Rigidlysecured (on the end of the :rod 110 isa camcollar 111 provided with an angularlydisposed cam slot 112 within which .isengaged theangularly arranged free end sofa camlever 113. "The lever 113 is rigidly mounted on a stub shaft 114 having suitable and extendingtherethrough to receive an operating lever 115 extendlng forwardly toward'slthe front face of the headcasing.

The outer plate 80 of thefeed changegear supportingsubstructure carries an annular hub 116 concentric Wit-lithe shaft 105 and through which extends the endoi' that shaft.

117 having a pivotal bearing thereon. Within the housing isprovided a pair of plck-ofl' i change feed gears, the housing heingidivided 1 i i i A ;clrivingpick-ofi gear 118 ,isjmounted on to provide a removahlefcover over the gears.

the end of the shaft l and removably se- I let steeth to" give desired feed changes to the longitudinal travelof the tool spindle.

The pinion 122isadapted for selective engagement, by'the swingingof the housing 117 Withagear 123 (seeFig. 3) mounted on the shaft 124'having stationary-hearings in the walls of the head casing 8. .Theshaft 124eX- tends outwardly of the opposite side of the head casingand carries a-rigidly nou11ted pinion 125vvhich is constantly in mesh with an internal gear 126 rigidly mounted on a shaft 127 extending through the hea d ca sing and having suitable hearings in the walls thereof. 2 The s'haft127 is-provided within the V casing with a pinion 128 which is in constant mesh withthe teeth of a rack bar 129 carried by the spindle sleeve 13L The spindle sleevehearing is cut away adjacent to the p111- ionl28e to expose the rack teeth for engage" ment by thepinion. Mountedon the shaft 124 outwardly oi the gear 123 is a spider armed hand,wheel;130 by which the spindle sleeve may-be manuallyoperated in itslongitudinialmovement. V V

Engagement hetween the P1111011 122 and gear 1231s accomplished by means ofthe swinging of the piokiojff gear housing 117,

the latter heingprovided with a forwardly hextendingmemher 131 provided at; its end lwith a handle 132 in convenientpos tion for manipulationlhy an operator. positioned, he

1013611116 machine. To engagethe pinion 122 pariafg 12 3the hanaleiae is raisedtolswing -,t1'ai11, the operatorimay. releasethe lever 133 from thei stud'135 and lower the arm 131, thus swinging the pick-oil gear housing to the gear housing,fand isretamed in raised 'position'by means of a latch device comprising a lever 133 pivoted on the forwardly projecting arm 131, one arm of the lever extending along side the handle 132 and confining therehetween a coiledspring 134 tending to 1 force the adjacent armof the lever away from the handle. The opposite arm of the lever 133 is provided with a lateral notch which engagesa stud 135 rigidly positioned uponthe side WallOf the head casing, the notch and stud being normally retained in engaged relation by means of the spring 134. To manually disengage the feed driving disengage the pinion ,122. Automatic provision iis' made for releasing the lever l33from thestud 135and disengaging the spindle feed gears, topermit a predetermined limitation of the lowermost position of the tool spindle in the operation of sinking the tool in the work to adesired depth.

The automatic release mechanism includes a link 136 pivotally secured to; the notched end of the lever 133and pivotally attached also to the crank 137 rigidly mounted on a shaft 138 extending through and having its hearings in the side walls of the head easing.

"The, oppositdend of the shaft l38-carriesa ,rigidly mountedcrank 139 (see Figs. land 1 3)havinga slot in its free endin which; is

operatively positioned apiri carried by a crankarm 140 mounted on the shaft 127 outshaft 127, so that withthe rotation ofthe" 140 is an adjustable elutch stop collar 1417. The stop, cellar 141 and the adjacent face of the crank arm 140' are each provided w'itha clutch tooth adapted for interengagement' whenthe crank arm has traveled outwardly into positionfor such engagement, s

Upon engagementof the stop collarwith the crank arm the latter is" caused to rotate with the shaft therehy"swinging the cranks 139 and 137- andthelink 136, whereby the notched lever 133 is withdrawn from the stud 135 and the piclcoff' gear housing 117 swings downwardly to {disengage the" pinion-122 fromthefgear 123 andjtherehy releasethe spindle-sleeve 13 from": the [feedldriving -=latter the crank arm travels longitudinally oftheshaft. Outwardly o f-the crank arm i train. By adjustment of the stop collar141 in its position on i the shaft 127, the down-- {Ward travel of the sleeve- 13 may be limited toanyldesir ed point.

of a chain 142] secured to' a suitable sheave downward travel of the spindle sleeve. The 1 chain 142 extends over an idler sheave-143 l 7 The sleeve 13 and spindle 11 are counter balanced in their feed movement by means on the shaft 127 and wound thereuponin the 100 i ,wardly, of the internal gear 126. The crank 1 arm has a screwthreaded'bearing on the into the interior of the supporting column 2 and carries a suitable counter-weight 144: suspended at its end.

It will be obvious that I have provided an improved construction of spindle supporting and operating mechanism particularly adapted for compact assembly in multi-unit machines in which all of the manually operated control devices are readily accessible to an operator positioned before the machine, and in which I have provided improved means for the automatic control of the cycles of operation of the spindle.

I claim as my invention:

1. In a machine tool, the combination of a closed casing substantially in the form of a right isosceles triangle positioned with one of its sides vertical, a pair of spindle bearings positioned one at the upper and lower extremities respectively of said side, a spindle in said bearings, change-speed mechanism geared to said spindle, said mechanism including a pair of shafts mounted in said casing in horizontally spaced relation and substantially parallel to the sloping upper side wall of said casing so as to provide a relatively large space between said shafts and the vertical forward wall of said casing, and gear mechanism operable to feed said spindle including feed-change gearing providing a plurality of feeding speeds, said gear mechanism being positioned as a removable unit within said casing between said change-speed mechanism and said vertical forward wall.

2. A machine tool having, in combination, a column, a work supporting table in front of said column, a casing on said column projecting forwardly therefrom over said table and providing vertically aligned and spaced bearings over said table, a rotatable spindle vertically movable in said bearings, said casing having a removable upper wall sloping downwardly and rearwardly from the upper one of said bearings, means for rotating said spindle at a plurality of different speeds including a plurality of shafts, bearing means for supporting said shafts within said casing in horizontally spaced relation adjacent said rearwardly sloping upper wall, said bearing means being arranged to permit removal of said shafts when said wall is removed, said casing having a removable side wall, and feeding means for said spindle including a plurality of horizontal shafts having a plurality of gears thereon and constituting a unit carried by said removable side wall, said last mentioned shafts and gears being arranged so that they may be removably positioned within said casing beneath said sloping drive shafts.

3. In a machine tool, the combination of a closed hollow casing substantially in the form of a right isosceles triangle positioned with one of its sides vertical, means providing a pair of spaced spindle bearings, a spindle in said bearings, change-speed mechanism geared to said spindle, said mechanism including a plurality of shafts mounted in said casing in horizontally spaced relation adjacent the sloping upper wall of said casing so as to provide a relatively large space between said shafts and the vertical forward wall of said casing, and spur-gear spindle feeding mechanism including means for providing a plurality of feeding speeds for said spindle, said spur-gear mechanism being removably positioned as a unit within said housing be tween said change-speed mechanism and said vertical forward wall.

a. In a machine tool, the combination of a closed casing having a rearwardly and downwardly inclined end wall and parallel side walls, one of said side walls being removable, a vertical spindle rotatably and slidably mounted in the forward portion of said casing, speed-change mechanism geared to said spindle to rotate the latter, said mechanism including parallel horizontally spaced shafts extending closely along and inside of said rear wall, a feeding unit for feeding said spindle axially, said unit comprising speed-change means and feed reversing means mounted on the inside of said removable side wall, and means mounted on the opposed side wall for adjusting said last two mentioned means.

5. In a machine tool, the combination of a closed casing substantially in the form of a right triangle, and having an upper wall sloping downwardly and rearwardly, a vertical spindle rotatably mounted in the front of said casing, change-speed mechanism geared to said spindle, said mechanism ineluding a pair of shafts mounted in said casing closely along said wall, a. gear in said casing operatively geared to said spindle for rotation therefrom, a. second gear in said casing operatively connected to said spindle for feeding the latter axially, a bearing structure normally positioned within said casing and removably secured for outward withdrawal therefrom, a gear case pivotally mounted on said structure, and an intermediate change-feed gearing mounted in part on said structure and in part in said gear case, said gearing including an inlet gear and an outlet gear, said inlet gear being movable into mesh with said first mentioned gear and said outlet gear being positioned for movement into mesh with said second mentioned gear upon mounting said structure in position in said casing.

' (3. In a machine tool, the combination of a. closed casing, a vertical spindle rotatably mounted in the front of said casing, change speed mechanism geared to said spindle for rotating the latter, a gear in said casing operatively connected to said spindle for synchronous rotation therewith, a second gear in said casing operatively connected to said spindle for feeding the latter axially,

a bearing structure normally positioned Within said casing and. removably secured for outward Withdrawal from one side thereof, a gear ease niovably mounted on said structure and an intermediate change-feed.

gearingmounted' in part on said structure and in part in said gear case, said gearing including an inlet gear and an outlet gear,

said inlet gearbeing movable into mesh with said first mentioned gear and sald outlet gear a being positioned for movement into mesh with said second mentioned gear-upon mounting said structure in position in said rcasing.

In testimony whereof, I have hereunto af-i ifix ed my signature.

ALBERT" M; JOHNSON. 

